UV levels are expected to be about 4% higher than pre-1980 levels this summer, due to the ongoing thinning of the ozone layer, according to Environment Canada scientists.

The ozone layer, in the upper atmosphere, continues to show some depletion over Canada. During the past winter, the ozone layer thinned, on average, by about 5%, worsening to 7% below normal in early spring. This depletion is expected to continue throughout the summer, at slightly reduced levels. These values are compared to the normal thickness of the ozone layer, before 1980, when ozone depletion was first recorded.

Exposure to UV rays from the sun increases the risk of sunburn, skin cancers and cataracts and could weaken the immune system. The increased UV levels expected this summer would add to these risks.

Environment Canada scientists created the UV index in 1992, and it is now used around the world to safeguard people from overexposure to the sun.

Despite a significant decline in the use of ozone-depleting chemicals, ozone loss continues and is particularly severe annually over the Antarctic and in some years over the Arctic. Scientists are concerned that climate change may now be contributing to the depletion of the ozone layer.

The UV index is included in Environment Canada’s daily weather forecast whenever values are expected to be greater than 3. Use the UV Index forecast as a guide and take precautions when exposed to the sun.

For daily weather reports in Canada, please click HERE.

Article from Environment Canada’s World Wide Web Site.